A 60.0 kg student runs up a flight of stairs in Rockefeller Hall a height of 4.0 m in a time of 6.0 s. What average mechanical power (in W)

Question

A 60.0 kg student runs up a flight of stairs in Rockefeller Hall a height of 4.0 m in a time of 6.0 s. What average mechanical power (in W) is required to do this?

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bonexptip 4 years 2021-09-02T21:04:50+00:00 2 Answers 29 views 0

Answers ( )

  1. Philomena
    0
    2021-09-02T21:06:41+00:00
    Reply

    Answer:

    392 W.

    Explanation:

    Given:

    Mass, m = 60 kg

    Height, h = 4 m

    Time, t = 6 s

    Power = energy/time

    Energy = mass × acceleration × distance

    Power = (60 × 9.8 × 4)/6

    = 392 W.

  2. thnahdat
    0
    2021-09-02T21:06:44+00:00
    Reply

    Answer:

    400watts

    Explanation:

    Power is defined as the amount of energy expended in a specific time. It is also defined as the change in work done with respect to time.

    Mathematically,

    Power = Workdone/time

    Work done = Force×distance

    Power = Force × Distance/Time

    Given force = mass× acceleration due to gravity

    Force = 60×10 = 600N

    Distance covered = 4.0m

    Time taken = 6.0seconds

    Power expended = 600×4/6

    Power expended = 400Watts

    The average mechanical power (in W) required to do this is 400Watts

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